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ASoC: SOF: Intel: hda: Fix potential buffer overflow by snprintf()

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snprintf() returns the would-be-filled size when the string overflows
the given buffer size, hence using this value may result in the buffer
overflow (although it's unrealistic).

This patch replaces with a safer version, scnprintf() for papering
over such a potential issue.

Fixes: 29c8e4398f ("ASoC: SOF: Intel: hda: add extended rom status dump to error log")
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Link: https://lore.kernel.org/r/20220801165420.25978-4-tiwai@suse.de
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Takashi Iwai 2022-08-01 18:54:20 +02:00 committed by Mark Brown
parent 1eb123ce98
commit 94c1ceb043
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GPG key ID: 24D68B725D5487D0
1 changed files with 1 additions and 1 deletions
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2
sound/soc/sof/intel/hda.c
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@ -574,7 +574,7 @@ static void hda_dsp_dump_ext_rom_status(struct snd_sof_dev *sdev, const char *le
chip = get_chip_info(sdev->pdata);
for (i = 0; i < HDA_EXT_ROM_STATUS_SIZE; i++) {
value = snd_sof_dsp_read(sdev, HDA_DSP_BAR, chip->rom_status_reg + i * 0x4);
len += snprintf(msg + len, sizeof(msg) - len, " 0x%x", value);
len += scnprintf(msg + len, sizeof(msg) - len, " 0x%x", value);
}
dev_printk(level, sdev->dev, "extended rom status: %s", msg);